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amg4psblas/amgprec/impl/solver/amg_d_base_ainv_update_a.f90

82 lines
3.1 KiB
Fortran

!
!
! AMG-AINV: Approximate Inverse plugin for
! AMG4PSBLAS version 1.0
!
! (C) Copyright 2020
!
! Salvatore Filippone University of Rome Tor Vergata
!
! Redistribution and use in source and binary forms, with or without
! modification, are permitted provided that the following conditions
! are met:
! 1. Redistributions of source code must retain the above copyright
! notice, this list of conditions and the following disclaimer.
! 2. Redistributions in binary form must reproduce the above copyright
! notice, this list of conditions, and the following disclaimer in the
! documentation and/or other materials provided with the distribution.
! 3. The name of the AMG4PSBLAS group or the names of its contributors may
! not be used to endorse or promote products derived from this
! software without specific written permission.
!
! THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
! ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
! TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
! PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
! BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
! CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
! SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
! INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
! CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
! ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
! POSSIBILITY OF SUCH DAMAGE.
!
!
subroutine amg_d_base_ainv_update_a(sv,x,desc_data,info)
use amg_d_base_ainv_mod, amg_protect_name => amg_d_base_ainv_update_a
use psb_base_mod
implicit none
type(psb_desc_type), intent(in) :: desc_data
class(amg_d_base_ainv_solver_type), intent(inout) :: sv
real(psb_dpk_),intent(in) :: x(:)
integer(psb_ipk_), intent(out) :: info
! Local variables
real(psb_dpk_), allocatable :: dd(:), ee(:)
integer(psb_ipk_) :: nrows, ncols, i, j, k, nzr, nzc, ir, ic
type(psb_d_csc_sparse_mat) :: ac
type(psb_d_csr_sparse_mat) :: ar
dd = sv%dv%get_vect()
if (size(x)<size(dd)) then
write(0,*) 'Wrong size in update',size(x),size(dd)
info = -1
return
end if
ee = x(1:size(dd))
call sv%z%cp_to(ac)
call sv%w%cp_to(ar)
! Compute diag(W ee Z)
! First ee Z
call ac%scal(ee,info,side='L')
! Then diag(W (ee Z))
do i=1,ar%get_nrows()
ir = ar%irp(i); nzr = ar%irp(i+1)-ar%irp(i)
ic = ac%icp(i); nzc = ac%icp(i+1)-ac%icp(i)
ee(i) = psb_spdot_srtd(&
& nzr,ar%ja(ir:ir+nzr-1),ar%val(ir:ir+nzr-1),&
& nzc,ac%ia(ic:ic+nzc-1),ac%val(ic:ic+nzc-1))
end do
! Now invert diagonal
dd = done/dd
dd = dd + ee
dd = done/dd
sv%d = dd
call sv%dv%bld(dd,mold=sv%dv%v)
end subroutine amg_d_base_ainv_update_a